Sebastiaan van Stijn fc4916e72f Improve API docs for UsageData
The docs did not mention when this information
was set, and what the `-1` value indicated.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 194f635ce7d097f550986bc3169ab59158f5aa68
Component: engine
2017-07-19 16:25:38 +02:00
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